That's fantastic! Sometimes, it is not easy for someone used with major brands to appreciate these Britains figures due to their small size. Though, you've got some of the largest and better ones. I love Britains and the sculpts of these two figures are better than the counterparts from major brands. Both you got are two gens from 1961, the Asian elephant
#1311 and the Asian rhinoceros
#1314. Both already discontinued, of course.
There's something very special in Britains world that we don't see in major brands, figures are made in scale, so they give a good impression of the proportions between real animals. If you compare your elephant with your rhino, you'll have a good idea how they compare in real life. They are made to fit human figures of 54 mm representing an average sized person. We have a lot of work to do yet on Britains pages on Toy Animal Wiki, but you can see here an overview of Britains Zoo collection.